1、Two suction cups can be installed on a clean surface, and with alignment guide for 90-degree layout calculations. 2、Convenient and compact, you can generate two lines at a 90‑degree angle on the floor, wall or other places for layout. 3、Dual‑level bubble and infrared level can provide accurate alignment of flat or straight lines. 4、Can be used for a variety of materials, including tiles, pictures, stones, bricks, carpets, hardwood floors, etc. 5、Wide range of applications, can be used for carpentry, stair starting boards, shelves, tiles or any other places where precise alignment is required. Item Type: Infrared level Material: ABS Color: Blue Infrared Wavelength: Approx. 650mm / 25.6in Waterproof Rating: IP54 Accuracy: ±3 / 8in / 100 feet Self-Leveling Range: ±4in Battery: 3 x AA Batteries (Not Included) 1 x Infrared Level